Heuristic search for the coupled runway sequencing and taxiway routing problem

This paper presents the first local search heuristic for the coupled runway sequencing (arrival & departure) and taxiway routing problems, based on the receding horizon (RH) scheme that takes into account the dynamic nature of the problem. As test case, we use Manchester Airport, the third busiest airport in the UK. From the ground movement perspective, the airport layout requires that departing aircraft taxi across the arrivals runway. This makes it impossible to separate arrival from departure sequencing in practice. Operationally, interactions between aircraft on the taxiways could prevent aircraft from taking off from, or landing on, runways during the slots assigned to them by an algorithm optimizing runway use alone. We thus consider the interactions between arrival and departure aircraft on the airport surface. Compared to sequentially optimized solutions, the results obtained with our approach indicate a significant decrease in the taxiway routing delay, with generally no loss in performance in terms of the sequencing delay for a regular day of operations. Another benefit of such a simultaneous optimization approach is the possibility of holding aircraft at the stands for longer, without the engines running. This significantly reduces the fuel burn, as well as bottlenecks and traffic congestion during peak hours that are often the cause of flight delays due to the limited amount of airport surface space available. Given that the maximum computing time per horizon is around 95 s, real-time operation might be practical with increased computing power.     

浅析“浑太胡同”内公路路面高程的水文计算

介绍了"浑太胡同"的概念,并结合鞍山至台安高速公路工程实例,阐述了"浑太胡同"内公路路面高程的水文计算方法。     

基于遗传算法的区段站到发线运用优化安排

从模拟铁路区段站调度员思维角度出发,分析区段站车列占用到发线时区集合的特点,应用划分时间片算法建立合适的到发线安排的图论模型,将到发线安排问题转化为顶点具有加权的图的k 着色问题。依据设计混合遗传算法基本原则,将基于顺序的贪婪着色算法和遗传算法混合起来运用于该问题,设计有序的字符串编码方法,构造基于罚函数的适应度函数,采用交叉和变异等技术,给出混合遗传算法的基本求解步骤。     

TDJ-GST202型高速锁闭止轮顶在齐齐哈尔站的应用

本文详细介绍了TDJ-GST202型高速锁闭止轮顶在齐齐哈尔客站的实际应用情况,结果证明该设备能满足使用单位提出的各项技术要求,提高了客运站旅客列车的止轮、防溜效果,是一种比较有效的防溜制式,为解决客车线、到发线及编组站货物列车的止轮、防溜问题提供了一个较为成熟的方案.     

高铁车站跨车场接发列车引起客服系统信息误判的解决方案研究

为了解决高铁车站跨车场接发列车引起客服系统信息误判的问题,从列车到发时刻生成入手,剖析该信息从CTC系统生成并逐级下传至客服系统的全过程,提出两种解决方案,分析这两种方案的优缺点,并推荐了最佳解决方案。建议办理跨场接发列车的车站接入路局端"客服系统与TDMS系统接口设备"时,需提前修改该接口设备软件,即可避免客服系统信息误判,从而确保客服系统可靠、安全运行。     

Elaboration and quantitative assessment of manoeuvrability for motorcycle lane change

The desire to quantitatively assess vehicle manoeuvrability and handling has led to the development of various expressions, or metrics, which typically relate system input to system output. With regard to motorcycle manoeuvrability, a notable example of such a measure, or metric, is the Koch index [Koch, J., 1978, Experimentelle und Analytische Untersuchungen des Motorraad-Fahrer Systems. Dissertation, Berlin.]. This article describes the development of a new metric applied to lane change (LC) tests and coined ‘LC roll index’. This metric takes into account the peak-to-peak values of the rider-input steering torque divided by the peak-to-peak roll rate response of the vehicle and normalizes this quantity by the forward velocity. In addition to this new metric, an analytical expression is developed, which in many cases summarizes a motorcycle’s LC performance in a single, terse, analytical term. Experimental results are presented for three vastly different motorcycles: a scooter, a street, and a touring motorcycle performing variations of the LC manoeuvre. Numerous test runs for each vehicle are analysed and the results are summarized along with those presented in the recent literature. Finally, simulation results are presented to highlight the correlation between the proposed indices and handling.     

列车运行方案车站到发线需求可行性模型及其算法

车站到发线能力是计算机辅助编制列车运动图的重要组成部分，以列车会让方案为主线，系统地分析了单线铁路造成车到发展能力不足的根本原因，构造了列车运行方案车站到发线需求可行性线性０－１优化模型，提出了复杂性为０（ｎ）的快速算法，该模型与列车运行图总体优化吻合性好，有利于灵活设计算法，这一步对列车运行图优化显得尤为重要，本方法亦可适用于复线和多线铁路。     

铁路客运站到发线运用优化研究

详细分析客运站旅客列车到、发技术作业。把客运站到发线运用优化目标分解为方便旅客旅行、有利于保证行车作业安全与行车技术作业和有效地使用车站各种既有行车技术设备等三个子目标,并分别建立其优化模型。运用多目标规划理论与分枝定界法对模型进行求解。依据某大型双线通过式客运站的实际数据,应用优化模型进行到发线运用实例分析计算,计算所得方案的优化效果明显。     

合理制定铁路旅客票价的优化方法

在分析铁路旅客运输特点的基础上,讨论影响旅客出行广义费用的因素,提出了一种新的计算旅客广义出行费用的方法。随后用一个LOGIT模型来描述不同运输方式竞争条件下旅客出行方式的选择行为,在此基础上确定一个合适的票价,使铁路运输部门的经济效益最大,并给出了该模型的求解算法。最后用一个简单的算例来说明该模型及算法的应用。     

基于FTA的城市轨道交通非正常接发列车作业研究

基于故障树分析法(FTA),分析了城市轨道交通非正常接发列车的特征及事故情况;建立故障树模型,对事故进行定性分析并得出结论;通过南宁地铁1号线空气制动缓解继电器故障导致的列车延误事故,确定用故障树方法分析事故原因的可行性,给出行车安全的相关建议。